CONTENTS ' xi
CHAPTER XII
TURBINE CHARACTERISTICS...................164
Efficiency as a function of speed and gate opening—Specific speed
an index of type—Illustrations of specific speed—Selection of a
stock turbine—Illustrative case—Variable load and head—Char-
acteristic curve—Use of characteristic curve—Questions and
problems.
CHAPTER XIII
SELECTION OP TYi»ia OF TURBINE ................177
Possible choice—Maximum efficiency—Efficiency on part-load—
Overrate with high-speed turbine—Type of runner as a function
of head—Choice of type for low head—Choice of type for medium
head—Choice of type for high head—Choice of type for very high
head—Questions and problems.
CHAPTER XIV
COST OF TURBINKS AND WATER POWER .............192
General considerations—Cost of turbines—Capital cost of water
power-—Annual cost of water power—Cost of power per horse-
power-hour-—Sale of power—Comparison with steam power—
Value of water power—Questions and problems.
CHAPTER XV
DEHKJN OF THE TANGENTIAL WATER WHEEL........... 204
General dimensions—Nozzle design—Pitch of buckets—Design
of bxickete—Dimensions of case—Questions and problems.
CHAPTER XVI
DlDHXON OF THE REACTION T0RBINE...............211
Introductory-—Ckmeral dimensions—Profile of runner—Outflow
conditions and clear opening—Layout of vane on developed cones—
Intermediate profiles—Pattern maker's sections—The case and
speed ring—The guide vanes-—Questions and problems.
CHAPTER XVII
CENTRIFUGAL PUMPS......................230
Definition—Classification—Centrifugal action—Notation—Defini-
tion of head and efficiency—Head imparted to water—Losses—
Head of imp ending delivery—Relation between head, speed and
discharge—Defects of theory—Efficiency of a given pump—
Efficiency of series of pumps—Specific speed of centrifugal pumps
—Conditions of service—Construction—Questions and problems.